Lens-board clamp for cameras.



1%.. 739,586. 7 PATBNTED SEPT. 22, 1903 I P. B. CASE. LENS BOARD CLAMPFOR CAMERAS.

APPLICATION rnnn D30. 29. 1902. nminwsn JULY 23.1903.- 10 IQDEL.

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Patented September 22, 1903.

PATENT OFFICE.

FRANK B. CASE, OF ROCHESTER, NEW YORK.

LENS-BOARD CLAMP FOR CAMERAS.

SPECIFICATION forming part of Letters Patent N 0. 739,586, datedSeptember 22, 1903. Application filed December 29,1902. Renewed July 23,1903- Serial No. 166.773. (No model.)

To 0. whom it may concern:

Be it known that I, FRANK B. CASE, a citizen of the United States,residing at Rochester, in the county of Monroe and State of New York,have invented a new and Improved Lens-Board Clamp for Cameras, of whichthe following is a specification.

This invention relates to mechanism for securing the lens-board ofacamera-front in any desired position of vertical adjustment between itssupporting-standards.

The purpose of the present invention is to provide a clamping device fora lens-board of a camera-front which shall not tend to spread thestandards of the lens-board when such lens-board is clamped in place andone also which shall not necessitate the removal of a screw before thelens-board can be entirely removed from between its supporting-standardsand also one of such a character that a careless handling of the device,such as screwing the clamping-screw in too far, will not break any ofthe cooperating parts of the camera-front.

The several figures of the accompanying drawings, illustrating myinvention, are as follows:

Figure l is a face or front view of a lensboard a, supported from asuitable base g. Fig. 2 is a sectional view of the lens-board a andstandard Z), taken along the dotted line o: y in Fig. 1, with all theparts above such line removed. Fig. 3 is a left-hand edge view of theboard a as seen in Fig. 1.

Similar letters refer to similar parts throughout the several views.

Referring to the drawings, a is a lens-board of usual construction andsupported in the usual manner that is, tongues are formed on the edgesof such board a, which enter grooves made therefor in the standards b1),which are in turn rigidly secured at their lower ends to the base-pieceg. The standards b b are secured together at their upper ends by thebrace o. The tongue formed on the right-hand edge of the lens-board a iscontinuous, as is usual, while the tongue formed on the left-hand end,as seen in Fig. l, of such lens-board a, consists only of the sections aand a formed on the cross-pieces a and a of such front board. Thesecrosspieces a a and the lens-board a are framed together with groovesand tenous in the usual manner.

The left-hand edge, as seen in Fig. 1, of the middle section of thelens-board a is grooved and in such groove the metal stripsfandf areinserted loosely, as indicated, so as to project from the board a inabout the same way that the tongue (i a does. These strips ff are keptapart, as indicated in Fig. 3, by depressions stamped in such strips. Anut e is located near the center of the standardb in a hole boredthrough such standard, as indicated, and is prevented from turning andpulling out through the standard by the projections e 6 as indicatediu'Fig. l, to accommodate which the groove in the standard I) isdeepened a little near the center thereof. A thumb-screw d, bluntlypointed at its inner end, is threaded through the nut e in such a waythat the point will enter between the strips ff when such screw 61 isturned in through such nut c. This action, as indicated in Fig. 2, willseparate the strips ff and press them against the sides of the groove inthe standard I) and at the same time will force the board or against thestandard I) and take out all the play that exists when the board a isbeing adjusted. Thus when it is desired to adjust the board a verticallybetween the standards I) b the screw (1 is turned out from between thestrips ff, their pressure against the standard I) is relieved, and thedesired adjustment may be effected. Then the screw dis turned in, thestrips ff are forced apart against the sides of the groove in thestandard b, and the board a is again secured between the standards b. Itwill at once he understood that the pointed end of the screw dis soconformed that when the same is turned clear in as far as it will go thestrips ff will be separated just far enough to firmly bear against thesides of the groove in the standard b, but not with sufficient force tosplit the standard 17 by forcing apart too far the portions thereofeither side of the groove therein. The length of the screw (1 should ofcourse be so proportioned that when turned clear in it will not forcethe board a toward grooved member having thereon a divided or slottedtongue and such grooved member carrying a screw arranged when turned in,to force apart and against the sides of the groove in such groovedmember the portions of the divided or slotted tongue on such tonguedmember, such divided tongue consisting in two separated strips ofsuitable material inserted in a groove in such tongued member andprojecting therefrom into the groove in such grooved member.

FRANK B. CASE. Witnesses:

ALBERT O. BELL, A. PEARL MOORE.

